In order to research the degree that antiaircraft missile system menaced with distributed jamming, the concept of jamming track area was advanced. The characteristic of power synthesis and interference source distribution of distributed jamming were lucubrated, and the linear superposition relation between power synthesis and interference source quantity was proved. The jamming track area of antiaircraft missile system under monostatic radar, bistatic radar and network radar condition were analyzed, modeled and simulated. The simulation demonstrates that distributed jamming can badly oppress the jamming track area of antiaircraft missile system under monostatic radar and bistatic radar condition, and has a certain effect on its jamming track area under network radar condition. Antiaircraft missile system under network operational condition has an obvious capacity for countermining distributed jamming.
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In the experiment, laser diodes are used as pump sources, and large-mode-area Er3+Yb3+ co-doped double clad fiber lasers as the gain media. Adopting the structure of external cavity with a Fourier transform lens, blazing grating and outcoupling mirror, spectral beam combining of two Er3+Yb3+ co-doped double clad fiber lasers are achieved. The maximal output power of fiber laser is 520 mW and 545 mW respectively. With the combined beam power of 690 mW is obtained and the combined efficiency is 65% when the diffraction efficiency of grating is 80%. Meanwhile, the quality of beam is evaluated. The beam quality factor in the horizontal direction and vertical direction are 1.592 and 1.335 respectively.
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